: The official body for Russian standards. They often provide viewable versions of legacy documents.

Countries like Belarus (Gosstandart), Kazakhstan (Gosstandart), and Ukraine (DSTU) sell licensed copies. These are identical in technical content to the original 1975 version but may have national forewords.

You might wonder why a standard from 1975 is still in demand. The answer lies in infrastructure and legacy systems.

The document categorizes alloys into several groups (e.g., Al-Si, Al-Cu, Al-Mg) and provides strict limits on impurities like iron and silicon to ensure structural integrity.

Each family represents unique casting properties, mechanical strengths, and specific vulnerabilities (such as shrinkage or hot shortness). Alloy Group (Base System) Key Standard Grades General Characteristics Typical Applications (Silumins) AL2, AL4, AL4-1, AL9, AK9, AK7